Through wall fitting for fish tank



FIG. 1 is a perspective view of a through wall fitting for fish tank showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image; and,

FIG. 5 is a top plan view thereof, the bottom plan being a mirror image. 

The ornamental design for a through wall fitting for fish tank, as shown and described. 